The tarnish that forms on objects made of silver is solid silver sulphide.?

Update: The tarnish that forms on objects made of silver is solid silver sulphide. This can be removed by reacting it with aluminium metal to produce silver metal and solid aluminium sulphide. How many moles of the excess reactant remain unreacted after the reaction between 3.9 moles of silver sulphide with 6.3 moles of... show more The tarnish that forms on objects made of silver is solid silver sulphide. This can be removed by reacting it with aluminium metal to produce silver metal and solid aluminium sulphide.

How many moles of the excess reactant remain unreacted after the reaction between 3.9 moles of silver sulphide with 6.3 moles of aluminium metal is finished?
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